The instance member 'widget' can't be accessed in an initializer in flutter

i want to assign value of defulttitle into the text but its showing some error..

 final foldertitle =
 TextEditingController(text: folderbox.isEmpty ? defulttitle : folderbox.get(1));

class Addnotes extends StatefulWidget {
  const Addnotes(
      {super.key,
     
      
      this.defulttitle = "My passwords.."});

 
  final String defulttitle;
 
  @override
  State<Addnotes> createState() => _AddnotesState();
}

class _AddnotesState extends State<Addnotes> {
 
  BuildContext? myContext;
 
  final foldertitle =
      TextEditingController(text: folderbox.isEmpty ? defulttitle : folderbox.get(1)); //here i cant assign the value of defulttitle into the text..can anyone explain?thank you..

why i cant assign the value of defulttitle into the text..can anyone explain?thank you

>Solution :

You can use lazy initialization with late.

BuildContext? myContext;
 
late final foldertitle =....;

Also you can use initState. but you may need to create variable for BuildContext, better will be passing using method.